Buggy code:
public abstract class DelegatingDatabaseMetaData implements DatabaseMetaData { static final Constructor < DelegatingDatabaseMetaData > concreteImpl ; private final DatabaseMetaData _metaData ; private final Connection _conn ; public DelegatingDatabaseMetaData ( DatabaseMetaData metaData , Connection conn ) { } public static DelegatingDatabaseMetaData newInstance ( DatabaseMetaData metaData , Connection conn ) { } protected abstract void enforceAbstract ( ) { } public DatabaseMetaData getInnermostDelegate ( ) { } public int hashCode ( ) { } public boolean equals ( Object other ) { } public String toString ( ) { <START_BUG> StringBuffer buf = new StringBuffer ( "metadata<seq2seq4repair_space>" ) . append ( hashCode ( ) ) ; <END_BUG> buf . append ( "[" ) . append ( _metaData . toString ( ) ) . append ( "]" ) ; return buf . toString ( ) ; } public boolean allProceduresAreCallable ( ) throws SQLException { } public boolean allTablesAreSelectable ( ) throws SQLException { } public boolean dataDefinitionCausesTransactionCommit ( ) throws SQLException { } public boolean dataDefinitionIgnoredInTransactions ( ) throws SQLException { } public boolean deletesAreDetected ( int type ) throws SQLException { } public boolean doesMaxRowSizeIncludeBlobs ( ) throws SQLException { } public ResultSet getBestRowIdentifier ( String catalog , String schema , String table , int scope , boolean nullable ) throws SQLException { } public ResultSet getCatalogs ( ) throws SQLException { } public String getCatalogSeparator ( ) throws SQLException { } public String getCatalogTerm ( ) throws SQLException { } public ResultSet getColumnPrivileges ( String catalog , String schema , String table , String columnNamePattern ) throws SQLException { } public ResultSet getColumns ( String catalog , String schemaPattern , String tableNamePattern , String columnNamePattern ) throws SQLException { } public Connection getConnection ( ) throws SQLException { } public ResultSet getCrossReference ( String primaryCatalog , String primarySchema , String primaryTable , String foreignCatalog , String foreignSchema , String foreignTable ) throws SQLException { } public String getDatabaseProductName ( ) throws SQLException { } public String getDatabaseProductVersion ( ) throws SQLException { } public int getDefaultTransactionIsolation ( ) throws SQLException { } public int getDriverMajorVersion ( ) { } public int getDriverMinorVersion ( ) { } public String getDriverName ( ) throws SQLException { } public String getDriverVersion ( ) throws SQLException { } public ResultSet getExportedKeys ( String catalog , String schema , String table ) throws SQLException { } public String getExtraNameCharacters ( ) throws SQLException { } public String getIdentifierQuoteString ( ) throws SQLException { } public ResultSet getImportedKeys ( String catalog , String schema , String table ) throws SQLException { } public ResultSet getIndexInfo ( String catalog , String schema , String table , boolean unique , boolean approximate ) throws SQLException { } public int getMaxBinaryLiteralLength ( ) throws SQLException { } public int getMaxCatalogNameLength ( ) throws SQLException { } public int getMaxCharLiteralLength ( ) throws SQLException { } public int getMaxColumnNameLength ( ) throws SQLException { } public int getMaxColumnsInGroupBy ( ) throws SQLException { } public int getMaxColumnsInIndex ( ) throws SQLException { } public int getMaxColumnsInOrderBy ( ) throws SQLException { } public int getMaxColumnsInSelect ( ) throws SQLException { } public int getMaxColumnsInTable ( ) throws SQLException { } public int getMaxConnections ( ) throws SQLException { } public int getMaxCursorNameLength ( ) throws SQLException { } public int getMaxIndexLength ( ) throws SQLException { } public int getMaxProcedureNameLength ( ) throws SQLException { } public int getMaxRowSize ( ) throws SQLException { } public int getMaxSchemaNameLength ( ) throws SQLException { } public int getMaxStatementLength ( ) throws SQLException { } public int getMaxStatements ( ) throws SQLException { } public int getMaxTableNameLength ( ) throws SQLException { } public int getMaxTablesInSelect ( ) throws SQLException { } public int getMaxUserNameLength ( ) throws SQLException { } public String getNumericFunctions ( ) throws SQLException { } public ResultSet getPrimaryKeys ( String catalog , String schema , String table ) throws SQLException { } public ResultSet getProcedureColumns ( String catalog , String schemaPattern , String procedureNamePattern , String columnNamePattern ) throws SQLException { } public ResultSet getProcedures ( String catalog , String schemaPattern , String procedureNamePattern ) throws SQLException { } public String getProcedureTerm ( ) throws SQLException { } public ResultSet getSchemas ( ) throws SQLException { } public String getSchemaTerm ( ) throws SQLException { } public String getSearchStringEscape ( ) throws SQLException { } public String getSQLKeywords ( ) throws SQLException { } public String getStringFunctions ( ) throws SQLException { } public String getSystemFunctions ( ) throws SQLException { } public ResultSet getTablePrivileges ( String catalog , String schemaPattern , String tableNamePattern ) throws SQLException { } public ResultSet getTables ( String catalog , String schemaPattern , String tableNamePattern , String [ ] types ) throws SQLException { } public ResultSet getTableTypes ( ) throws SQLException { } public String getTimeDateFunctions ( ) throws SQLException { } public ResultSet getTypeInfo ( ) throws SQLException { } public ResultSet getUDTs ( String catalog , String schemaPattern , String typeNamePattern , int [ ] types ) throws SQLException { } public String getURL ( ) throws SQLException { } public String getUserName ( ) throws SQLException { } public ResultSet getVersionColumns ( String catalog , String schema , String table ) throws SQLException { } public boolean insertsAreDetected ( int type ) throws SQLException { } public boolean isCatalogAtStart ( ) throws SQLException { } public boolean isReadOnly ( ) throws SQLException { } public boolean nullPlusNonNullIsNull ( ) throws SQLException { } public boolean nullsAreSortedAtEnd ( ) throws SQLException { } public boolean nullsAreSortedAtStart ( ) throws SQLException { } public boolean nullsAreSortedHigh ( ) throws SQLException { } public boolean nullsAreSortedLow ( ) throws SQLException { } public boolean othersDeletesAreVisible ( int type ) throws SQLException { } public boolean othersInsertsAreVisible ( int type ) throws SQLException { } public boolean othersUpdatesAreVisible ( int type ) throws SQLException { } public boolean ownDeletesAreVisible ( int type ) throws SQLException { }

Fix:
StringBuilder buf = new StringBuilder ( "metadata<seq2seq4repair_space>" ) . append ( hashCode ( ) ) ;